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            <h1 style="display: none">mysql值为json数据的相关操作</h1>
            
            
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                <h3 id="1-使用redis集群做cache-缓存"><a href="#1-使用redis集群做cache-缓存" class="headerlink" title="1. 使用redis集群做cache 缓存"></a>1. 使用redis集群做cache 缓存</h3><p>配置</p>
<figure class="highlight clean"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><code class="hljs clean">CACHES = &#123;<br>    <span class="hljs-string">&quot;default&quot;</span>: &#123;<br>        <span class="hljs-string">&quot;BACKEND&quot;</span>: <span class="hljs-string">&quot;django_redis.cache.RedisCache&quot;</span>,<br>        <span class="hljs-string">&quot;LOCATION&quot;</span>: [<br>            <span class="hljs-string">&quot;redis://192.168.8.42:7000&quot;</span>,<br>            <span class="hljs-string">&quot;redis://192.168.8.42:7001&quot;</span>,<br>            <span class="hljs-string">&quot;redis://192.168.8.42:7002&quot;</span>,<br>            <span class="hljs-string">&quot;redis://192.168.8.42:7003&quot;</span>,<br>            <span class="hljs-string">&quot;redis://192.168.8.42:7004&quot;</span>,<br>            <span class="hljs-string">&quot;redis://192.168.8.42:7005&quot;</span>,<br>        ],<br>        <span class="hljs-string">&#x27;OPTIONS&#x27;</span>: &#123;<br>            <span class="hljs-string">&#x27;REDIS_CLIENT_CLASS&#x27;</span>: <span class="hljs-string">&#x27;rediscluster.RedisCluster&#x27;</span>,      # 连接类<br>            <span class="hljs-string">&#x27;CONNECTION_POOL_CLASS&#x27;</span>: <span class="hljs-string">&#x27;rediscluster.connection.ClusterConnectionPool&#x27;</span>,   # 连接池类<br>            <span class="hljs-string">&#x27;CONNECTION_POOL_KWARGS&#x27;</span>: &#123;     # 连接池参数<br>                <span class="hljs-string">&#x27;skip_full_coverage_check&#x27;</span>: <span class="hljs-literal">True</span>  # 连接报错时加参数：config get cluster-require-full-coverage<br>            &#125;,<br>        &#125;,<br>        # <span class="hljs-string">&quot;KEY_PREFIX&quot;</span>: <span class="hljs-string">&quot;myapp&quot;</span>,  # key前缀，默认为<span class="hljs-string">&#x27;&#x27;</span><br>        # <span class="hljs-string">&quot;VERSION&quot;</span>: <span class="hljs-number">1</span>,  # 版本号<br>        # <span class="hljs-string">&quot;KEY_FUNCTION&quot;</span>: <span class="hljs-string">&quot;cache_ext.key_function.make_key&quot;</span>,  # 自定义前缀规则，默认 KEY_PREFIX:VERSION:key<br>    &#125;,<br>&#125;<br></code></pre></td></tr></table></figure>
<p>备注：</p>
<ol>
<li>如果报错，认证有问题则修改 redis 方式：redis://:<a href="mailto:&#x70;&#x61;&#x73;&#115;&#x77;&#x6f;&#x72;&#x64;&#64;&#49;&#x39;&#x32;&#x2e;&#49;&#x36;&#x38;&#x2e;&#x38;&#46;&#52;&#x32;">&#x70;&#x61;&#x73;&#115;&#x77;&#x6f;&#x72;&#x64;&#64;&#49;&#x39;&#x32;&#x2e;&#49;&#x36;&#x38;&#x2e;&#x38;&#46;&#52;&#x32;</a>:7005 password 支持空字符串</li>
<li>如果集群访问有问题则LOCATION只用一个地址</li>
</ol>
<h3 id="2-session-是使用过cache"><a href="#2-session-是使用过cache" class="headerlink" title="2. session 是使用过cache"></a>2. session 是使用过cache</h3><figure class="highlight ini"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><code class="hljs ini"><span class="hljs-attr">SESSION_CACHE_ALIAS</span> = <span class="hljs-string">&#x27;default&#x27;</span><br><span class="hljs-comment"># SESSION_COOKIE_AGE = 3600 # 默认两周单位秒</span><br><span class="hljs-attr">SESSION_COOKIE_DOMAIN</span> = None <span class="hljs-comment"># session cookie域名 默认没有设置就是当前域名</span><br><span class="hljs-attr">SESSION_COOKIE_HTTPONLY</span> = <span class="hljs-literal">True</span> <span class="hljs-comment"># 设置session cookie是httponly</span><br><span class="hljs-attr">SESSION_COOKIE_NAME</span> = f<span class="hljs-string">&#x27;session_qc_&#123;REDIS_BASE_KEY&#125;&#x27;</span> <span class="hljs-comment"># session cookie的名字</span><br><span class="hljs-attr">SESSION_COOKIE_PATH</span> = <span class="hljs-string">&#x27;/&#x27;</span> <span class="hljs-comment"># session cookie的path</span><br><span class="hljs-attr">SESSION_COOKIE_SECURE</span> = <span class="hljs-literal">False</span> <span class="hljs-comment"># session cookie的secure</span><br><span class="hljs-attr">SESSION_ENGINE</span> = <span class="hljs-string">&#x27;django.contrib.sessions.backends.cache&#x27;</span> <span class="hljs-comment"># session存贮位置默认db</span><br><span class="hljs-attr">SESSION_EXPIRE_AT_BROWSER_CLOSE</span> = <span class="hljs-literal">False</span><br><span class="hljs-attr">SESSION_SAVE_EVERY_REQUEST</span> = <span class="hljs-literal">True</span>  <span class="hljs-comment"># session超时机制是否生效, 只有在为True时，SESSION_EXPIRE_AT_BROWSER_CLOSE 才会生效</span><br><br></code></pre></td></tr></table></figure>

<h3 id="3-报错"><a href="#3-报错" class="headerlink" title="3. 报错"></a>3. 报错</h3><figure class="highlight xquery"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><code class="hljs xquery">Django：Could<span class="hljs-built_in"> not</span> find backend <span class="hljs-string">&#x27;django_redis.cache.RedisCache&#x27;</span>: cannot <span class="hljs-keyword">import</span><span class="hljs-built_in"> name</span> <span class="hljs-string">&#x27;six&#x27;</span><br></code></pre></td></tr></table></figure>

<p>3.1 原因django 版本太高回退到 2.2.7 版本</p>
<figure class="highlight apache"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><code class="hljs apache"><span class="hljs-attribute">pip3</span> install django==<span class="hljs-number">2</span>.<span class="hljs-number">2</span>.<span class="hljs-number">7</span><br></code></pre></td></tr></table></figure>
<p>3.2 依旧报错</p>
<figure class="highlight pgsql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs pgsql">File &quot;/usr/local/lib/python3.6/site-packages/django/db/backends/mysql/operations.py&quot;, <span class="hljs-type">line</span> <span class="hljs-number">146</span>, <span class="hljs-keyword">in</span> last_executed_query<br>query = query.decode(errors=<span class="hljs-string">&#x27;replace&#x27;</span>)<br>AttributeError: <span class="hljs-string">&#x27;str&#x27;</span> <span class="hljs-keyword">object</span> has <span class="hljs-keyword">no</span> <span class="hljs-keyword">attribute</span> <span class="hljs-string">&#x27;decode&#x27;</span><br></code></pre></td></tr></table></figure>
<p>解决办法，将文件 146 行 decode改成encode<br>修改后的结果</p>
<figure class="highlight stata"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><code class="hljs stata"><span class="hljs-keyword">query</span> = <span class="hljs-keyword">query</span>.<span class="hljs-keyword">encode</span>(errors=&#x27;<span class="hljs-keyword">replace</span>&#x27;)<br></code></pre></td></tr></table></figure>
                
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